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Multilined string in PHP can be written in many different ways to have your codes look clean and neat.

Method 1: You can break the lines into multiple strings on multiple lines using a period in front of the assignment sign in order to concatenate them.

Usage:
$st  = “This is the book”;
$st .= ” that I really like to read in my spare time.”;
$st .= ” I bring it with me while I’m traveling this summer.”;

Method 2: Use excerpt sign and close it at the end of all the lines. You must write exact same name as you previously defined it.

Usage:
$st = <<<STOPHERE
<p>This is the book
that I really like to read in my spare time. I bring it with me while I’m traveling this summer.</p>
STOPHERE;

__FILE__ is a built-in php global variable that you can use to get the location of a file that’s executing.

Usage: echo __FILE__;

Result (Linux): /var/www/html/my-domain.com/TestDir/setExpiredDate.php

(Windows): C:\Documents and Settings\myname\My Documents\www\TestDir\setExpiredDate.php

Sometimes you’ll see quotation marks in a string that represent exact language that has come from somebody else. The quotation mark is also used to designate speech acts in fiction and poetry. For example: Mr. Douglas, who was working in his field that morning, said, “The alien spaceship appeared right before my own eyes.”

In this case, if you want to echo this string out on a php page, you will have to add a backslash in front of each quotation mark to ensure that it will appear on the html page.

echo "<P>Mr. Douglas, who was working in his field that morning, said, \”The alien spaceship appeared right before my own eyes.\”</P>";